Mixed-phase MoTe2 with exposed edges and rich defects for catalyzing hydrogen evolution reaction with noble-metal-like performance

Interface Engineering of 2D Materials for Highly Performing Electronic and Energy Devices

“…68 Therefore, excellent catalytic activity can be expected with optimized electronic structures, locally accumulated charge carriers, reduced energy barriers for charge transfer, and enhanced catalytic active area. The semiconducting 2H and metallic 1T (or 1T') phases of polymorphic TMDs (such as MoS 2 69 and MoTe 2 70 ) have been cosynthesized by conventional chemical vapor deposition (CVD) method under specific growth environments. 11 Lee and co-workers reported that the hydrogen evolution rate (often referred to as current density j 0 ) linearly increases with boundary length in a unit area boundary (see Figure 8E).…”

Assessing Challenges of 2D-Molybdenum Ditelluride for Efficient Hydrogen Generation in a Full-Scale Proton Exchange Membrane (PEM) Water Electrolyzer

“…Although 1T′-MoTe 2 has never been tested in an electrolyzer, there are numerous reports suggesting it is more than capable of sustaining high current densities in sulfuric acid. ,− A recent report has suggested that it has a lower overpotential than Pt at a given current density, however, only when tested in a three-electrode (half-cell) setup in sulfuric acid . The main attraction of using 1T′-MoTe 2 is that it can be grown as ultrathin films directly on common gas-diffusion layers (GDLs) such as carbon cloth (CC), thus circumventing the need for immobilizing it on a Nafion membrane or on a GDL by spraying.…”

“… 23 , 28 − 31 A recent report has suggested that it has a lower overpotential than Pt at a given current density, however, only when tested in a three-electrode (half-cell) setup in sulfuric acid. 31 The main attraction of using 1T′-MoTe 2 is that it can be grown as ultrathin films directly on common gas-diffusion layers (GDLs) such as carbon cloth (CC), thus circumventing the need for immobilizing it on a Nafion membrane or on a GDL by spraying. The direct film growth can minimize the deformation (and cracking) of the catalyst layer at the membrane assembly interface and lead to improved durability of the electrolyzer.…”

Te-doped-WSe2/W as a stable monolith catalyst for ampere-level current density hydrogen evolution reaction

“…Both theoretical predictions and experimental findings suggest that the HER activity of TMDs primarily stems from their edges rather than their basal planes. 35,36 Various techniques have been devised to improve the catalytic performance of TMDs, such as defect engineering, 37 heterostructure fabrication, 38 phase conversion 39 and foreign atom doping. 40 Wang et al synthesized metallic WSe 2 nanoscrolls used as electrocatalysts for the HER, demonstrating much enhanced electrocatalytic performance compared to the semiconducting 2H WSe 2 nanoscroll counterparts.…”